{"id":"9d90aa33-0c53-4ea1-baa4-a1e1ac56e4a4","shortId":"nLCTrh","kind":"x402","title":"x402-gated premium API access on Base, paid per-request in USDC.","tagline":"x402-gated premium API access on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall. The specific resource path (`/api/v1/stripe/invoices/187`) suggests it returns invoice or billing-related data, though the exact response payload is not documented. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme.\n\nThe x402 challenge advertises a maxAmountRequired of 20,000 base units. Since USDC uses 6 decimals, this converts to $0.02 per request — consistent with the site-wide pricing of $0.02/request shown on the provider's landing page. The provider markets itself as offering no API keys, no rate limits, and instant access, with all payments handled on-chain on Base.\n\nThe provider hosts a broader suite of endpoints spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and utility services — all at the same $0.02/request price point. However, this specific listing covers only the `/api/v1/stripe/invoices/187` resource. Documentation beyond the landing page is essentially empty (all doc/pricing/API pages just show \"Connect wallet\"), so the exact request format and response schema for this endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-billing","invoice-data","json-response"],"categories":["finance","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","invoice API","stripe invoice data","lowpaymentfee"],"warnings":["No API documentation available — all doc pages render only 'Connect wallet'","Exact request body format and response schema are unknown","The endpoint path contains a hardcoded invoice ID (187), which is unusual for a general-purpose API","No OpenAPI spec, no examples, no error documentation provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/187","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/stripe/invoices/187","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation of request parameters, response schema, or what data this endpoint actually returns. All doc pages are empty ('Connect wallet' only). The specific resource path '/api/v1/stripe/invoices/187' with a hardcoded ID is unusual and 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'/request':111,172 '0.02':99,110,171 '000':88 '0x8335':73 '20':87 '2913':74 '6':94 'Base network API' 'USDC micropayment endpoint' 'access':6,20,36,133 'advertis':83 'ai/ml':154 'analysi':157 'analyt':153 'api':5,19,35,126 'base':8,22,68,89,142 'base-network' 'behind':37 'beyond':185 'bill':52 'billing-rel':51 'broader':147 'chain':140 'challeng':82 'classif':159 'connect':197 'consist':102 'contract':72 'convert':97 'cover':179 'data':54,152,162 'decim':95 'doc/pricing/api':193 'document':62,184 'embed':160 'empti':191 'endpoint':30,150,209 'essenti':190 'exact':57,78,201 'feed':163 'finance/crypto':161 'format':203 'gate':3,17 'handl':137 'host':145 'howev':175 'infer':155 'instant':132 'invoic':49 'invoice API' 'invoice-data' 'json-response' 'key':127 'land':117,187 'limit':130 'list':178 'lowpaymentfee' 'lowpaymentfee.com':32 'market':121 'maxamountrequir':85 'network':69 'offer':124 'on-chain':138 'page':118,188,194 'paid':9,23 'path':44 'pay-per-call API' 'payload':59 'payment':63,136 'paywal':40 'per':11,25,100 'per-request':10,24 'per-request-billing' 'point':174 'premium':4,18,34 'price':108,173 'provid':33,115,120,144 'rate':129 'relat':53 'request':12,26,101,202 'resourc':43,183 'respons':58,205 'return':48 'schema':206 'scheme':79 'sentiment':156 'servic':166 'settl':65 'show':196 'shown':112 'sinc':91 'site':106 'site-wid':105 'span':151 'specif':42,177 'stripe invoice data' 'suggest':46 'suit':148 'summar':158 'though':55 'unit':90 'unknown':211 'usdc':14,28,71,92 'usdc-settlement' 'use':70,93 'util':165 'via':75 'wallet':198 'wide':107 'x402':2,16,39,77,81 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"74c0b0f8-30ef-47ec-a5ff-79f6708678c6","listingId":"9d90aa33-0c53-4ea1-baa4-a1e1ac56e4a4","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/stripe/invoices/187","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:54.077Z"}],"sources":[{"listingId":"9d90aa33-0c53-4ea1-baa4-a1e1ac56e4a4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/187","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:54.077Z","lastSeenAt":"2026-04-26T21:04:57.133Z"}],"details":{"listingId":"9d90aa33-0c53-4ea1-baa4-a1e1ac56e4a4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/187 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/187"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/187"}],"useCases":["Retrieving invoice or billing data behind a per-request paywall","Agent-driven on-chain micropayment API consumption","Programmatic access to premium data without API key management"],"bestFor":["Agents or bots that can settle x402 payments in USDC on Base","Developers wanting keyless, pay-per-use API access","Low-volume consumers who prefer no subscription commitments"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.2Z"},"updatedAt":"2026-04-26T21:04:57.133Z"}}